Powder paint supply device

Abstract

A fluidized type paint powder tank has a fluidizing chamber for fluidizing paint powder and a storage chamber into which the paint powder in the fluidizing chamber is fed to keep it still. There is also provided a paint supply device for an electrostatic powder painting apparatus that includes a paint tank for containing paint powder and a painting gun coupled to the paint tank through an injector and a hose. The device includes a discharge member for discharging the paint powder from the paint tank and a hopper for receiving the paint powder discharged by the discharge member. A screw feeder is provided under the hopper. With this arrangement, the paint powder supplied at a uniform rate by the screw feeder is fed into the injector.

What is claimed is: 
     
       1. A paint powder supply device comprising: a paint powder tank, an outlet pipe connected to a lower part of said paint powder tank and defining a flow path along which paint powder discharges from the tank, a pinch valve provided in-line with said outlet pipe, an air supply line connected to said pinch valve, said pinch valve closing the flow path defined by said outlet pipe when air is supplied to the pinch valve via said air supply line, and a branch pipe connected to said air supply line and to said outlet pipe at a location upstream of said pinch valve with respect to the flow of paint powder along said flow path such that when air is supplied through said air supply line, air will flow to said outlet pipe to prevent the outlet pipe from becoming clogged with paint powder while the pinch valve is closed. 
     
     
       2. A paint powder supply device as claimed in claim 1, and further comprising a one-way valve provided in said branch pipe, said one-way valve allowing flow in said branch pipe only in a direction from said air supply line to said location upstream of said pinch valve.